/**
 * Created by sheny on 2017/1/11.
 */
public class test1 {
    public static void main(String[] args){
        Object o  = null;
        String str= String.valueOf(o);
        //String str2 = o.toString();
        System.out.println(str.equals("null"));
        //System.out.println(str2);

    }
}
